Sahih al-Bukhari 2410
Sahih al-Bukhari · Book 44: Khusoomaat · About the people and quarrels
Narrated `Abdullah:
حَدَّثَنَا أَبُو الْوَلِيدِ ، حَدَّثَنَا شُعْبَةُ ، قَالَ عَبْدُ الْمَلِكِ بْنُ مَيْسَرَةَ أَخْبَرَنِي قَالَ سَمِعْتُ النَّزَّالَ ، سَمِعْتُ عَبْدَ اللَّهِ ، يَقُولُ سَمِعْتُ رَجُلاً، قَرَأَ آيَةً سَمِعْتُ مِنَ النَّبِيِّ، صلى الله عليه وسلم خِلاَفَهَا، فَأَخَذْتُ بِيَدِهِ، فَأَتَيْتُ بِهِ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ " كِلاَكُمَا مُحْسِنٌ " . قَالَ شُعْبَةُ أَظُنُّهُ قَالَ " لاَ تَخْتَلِفُوا فَإِنَّ مَنْ كَانَ قَبْلَكُمُ اخْتَلَفُوا فَهَلَكُوا ".
I heard a man reciting a verse (of the Holy Qur'an) but I had heard the Prophet (ﷺ) reciting it differently. So, I caught hold of the man by the hand and took him to Allah's Messenger (ﷺ) who said, "Both of you are right." Shu`ba, the sub-narrator said, "I think he said to them, "Don't differ, for the nations before you differed and perished (because of their differences). "